For engineers: Always drive this motor with a voltage source at or near 26V for optimal torque-speed flatness. Do not substitute a 12V-rated driver without recalculating current limits.

The is a custom-labeled, highly efficient NEMA 17 hybrid stepper motor manufactured by Keli Motor Group and widely deployed as an OEM component in Creality 3D printers, such as the Ender 3 series and Ender 3 S1 Pro . Despite its ubiquity driving X, Y, or Z-axis movements, an official public datasheet from Creality or Keli is notoriously difficult to secure.

The BJ42D15 26V10 is a hybrid stepper motor (42mm x 42mm faceplate). The nomenclature tells a story:

| Parameter | Typical / Assumed Value | |---|---| | Frame size | 42 mm | | Step angle | 1.8° | | Rated voltage | 26 V | | Rated current | 10 A | | Phase resistance | ~2.6 Ω (estimate) | | Inductance | 1–10 mH | | Holding torque | 0.3–0.8 N·m | | Shaft dia. | 5 mm | | Mounting | NEMA17 pattern |

The is a specialist tool, not a generalist. It sacrifices holding torque for speed, efficiency, and thermal management. Its exclusive 26V/10Ω winding makes it a rare gem for battery-operated devices, high-speed light-load positioning, and low-heat environments.

Normal stepper motor operating temperature is up to 80–100°C (surface). Excessive heat suggests the current is too high or the Vref is set incorrectly . Using the 26V10 at the 1.5A peak for too long without cooling can degrade it.

The BJ42D15 series includes several sub-models whose .

Given the specificity of your request and the model "BJ42D15 26V10", here's a structured approach on how you might find or interpret such a datasheet:

The holding torque for a 34mm motor in this class is typically around 0.2 N·m (28 oz·in), which is modest compared to 40mm motors but sufficient for moving light gantries in 3D printers and engravers. More importantly, the is very low, allowing for smooth manual movement when the motor is not powered.

While a formal, exclusive "Datasheet PDF" for the stepper motor may not exist in public databases, the technical data is well understood within the engineering and 3D printing community. It is a 0.8A, 26V, 34mm NEMA 17 bipolar stepper with a 6.0Ω winding resistance. It is used extensively by Creality, ELEGOO, and TOOCA in their motion control systems.

The 34mm variants like share the same mechanical dimensions, but differ greatly in current handling :